scholarly journals Infrared Absorption and Reflection Spectra of Crystalline TCNQ Salts

1989 ◽  
Vol 42 (2) ◽  
pp. 203 ◽  
Author(s):  
Ajay T Oza
Keyword(s):  
Dielectric Constant ◽  
Imaginary Part ◽  
Infrared Absorption ◽  
Reflectance Spectra ◽  
Reflection Spectra ◽  
Reflectance Curve ◽  
The Real ◽  
Broad Maximum ◽  
Absorption Features ◽  
Reflection Characteristics

The polarised absorption and reflectance spectra of the three TCNQ salts pyridinium (TCNQh, triethylammonium (TCNQh and thermally damaged quinolinium (TCNQh indicate that the absorption features are governed by reflection characteristics. The maximum reflectance curve shows a broad minimum which corresponds to a negative dip in the real part of the dielectric constant and a broad maximum in the imaginary part, as calculated using a Kramers-Kronig

scholarly journals Determination of the complex dielectric permeability of liquid at the radiation frequency 32 GHz

2021 ◽  
Vol 1198 (1) ◽  
pp. 012012
Author(s):  
B G Tsydypov ◽  
A V Bazarov ◽  
B V Basanov ◽  
B Z Garmaev ◽  
E Yu Korovin ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Reflection Coefficient ◽  
Imaginary Part ◽  
Dielectric Permeability ◽  
Complex Dielectric Constant ◽  
Radiation Frequency ◽  
Layer Depth ◽  
The Real

Abstract Method and device for measuring the complex dielectric constant of liquids are described. The real part of the complex dielectric constant calculated from the conditions for the maximum and minimum of the measured interference dependence of the reflection coefficient on the layer depth. The imaginary part determined by selection to the maximum coincidence of the calculated and measured dependences of the reflection coefficient.

Effect of the cobalt ferrite and carbon fiber powder doping ratio on the electromagnetic properties of coated polyaniline-based polyester–cotton fabric

2021 ◽  
pp. 004051752110608
Author(s):  
Yi Wang ◽  
Yuanjun Liu ◽  
Chao Yang ◽  
Xiaoming Zhao
Keyword(s):  
Dielectric Constant ◽  
Carbon Fiber ◽  
Cotton Fabric ◽  
Imaginary Part ◽  
Reflection Loss ◽  
Cobalt Ferrite ◽  
Electromagnetic Properties ◽  
Loss Angle ◽  
The Real ◽  
Doping Ratio

In this project, firstly, polyaniline-based polyester–cotton fabric was prepared by in situ polymerization using polyester–cotton fabric as the base fabric, aniline as the monomer, ammonium persulfate as the oxidizer, and camphor sulfonic acid as the dopant. Secondly, cobalt ferrite/carbon fiber powder-coated polyaniline-based polyester–cotton fabric was prepared by the textile coating process using polyaniline-based polyester–cotton fabric as the base fabric, PU2540-type polyurethane as the adhesive, and cobalt ferrite and carbon fiber powder as functional particles. Finally, the effect of the cobalt ferrite and carbon fiber powder doping ratio on the shielding effectiveness, reflection loss, dielectric constant real part, imaginary part, and loss angle tangent of cobalt ferrite/carbon fiber powder-coated polyaniline-based polyester–cotton fabric was studied by using the controlled variable method with emphasis on the cobalt ferrite/carbon fiber powder doping ratio. The results show that in the frequency range of 0.01–3.0 GHz, when the doping ratio of cobalt ferrite to carbon fiber powder is 0:3, the reflection loss of cobalt ferrite/carbon fiber powder-coated polyaniline-based polyester–cotton fabric reaches the minimum value at 1.49 GHz, the minimum reflection loss is –21.4 dB, and the effective absorption band is 1.25–1.94 GHz. In the test band, the shielding efficiency, reflection loss, the real part and imaginary part of the dielectric constant, and the loss angle tangent of the carbon fiber powder-coated polyaniline-based polyester–cotton fabric are larger than those of cobalt ferrite-coated polyaniline-based polyester–cotton fabric. The smaller the doping ratio of cobalt ferrite to carbon fiber powder, the larger value of the shielding efficiency, reflection loss, the real part and imaginary part of the dielectric constant, and loss angle tangent of the cobalt ferrite/carbon fiber powder-coated polyaniline-based polyester–cotton fabric.

A WAVE-GUIDE METHOD OF MEASUREMENT OF THE DIELECTRIC CONSTANT OF LOW-LOSS LIQUIDS

1963 ◽  
Vol 41 (8) ◽  
pp. 1314-1320 ◽  
Author(s):  
I. R. Dagg ◽  
G. E. Reesor
Keyword(s):  
Dielectric Constant ◽  
Carbon Tetrachloride ◽  
Imaginary Part ◽  
Wave Guide ◽  
Impedance Change ◽  
Frequency Range ◽  
Low Loss ◽  
Dielectric Interface ◽  
The Real ◽  
Method Of Measurement

A method of measurement of the real and imaginary parts of the dielectric constant of low-loss liquids is described. The real part of the dielectric constant is derived from the impedance change at an air–dielectric interface in a wave guide; the imaginary part is derived from attenuation measurements made on a liquid-filled guide. The results of initial measurements on carbon tetrachloride and heptane in the frequency range 8.2 to 12.4 Gc/s are given.

Infrared absorption features for tetrahedral ammonia ice crystals

Icarus ◽  
1989 ◽  
Vol 80 (1) ◽  
pp. 220-223 ◽  
Author(s):  
Robert A. West ◽  
Glenn S. Orton ◽  
Bruce T. Draine ◽  
Earl A. Hubbell
Keyword(s):  
Infrared Absorption ◽  
Ice Crystals ◽  
Absorption Features

The Strengths of Near‐Infrared Absorption Features Relevant to Interstellar and Planetary Ices

2005 ◽  
Vol 620 (2) ◽  
pp. 1140-1150 ◽  
Author(s):  
P. A. Gerakines ◽  
J. J. Bray ◽  
A. Davis ◽  
C. R. Richey
Keyword(s):  
Infrared Absorption ◽  
Near Infrared ◽  
Absorption Features ◽  
Planetary Ices

scholarly journals Preparation and characterization of polyani-line/polyvinyl alcohol nanocomposite by laser irradiation

2017 ◽  
Vol 6 (4) ◽  
pp. 77
Author(s):  
N A M Shahin ◽  
S Abd El Mongy ◽  
R Kamal ◽  
A B El- Bially ◽  
A A Shabaka ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Relaxation Time ◽  
Polyvinyl Alcohol ◽  
Laser Irradiation ◽  
Imaginary Part ◽  
Electronic Transition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Amorphous Nature

Polyaniline (PANI) - Polyvinyl alcohol (PVA) nanocomposite were prepared using laser irradiation method. X-ray diffraction results showed that, (PANI/PVA) nanocomposite exhibited amorphous nature of polymer. The electronic transition will be studied using Ultraviolet-Visible spectrometer (UV-Vis). The real part of dielectric constant (έ) and imaginary part (ε") were studied. Also, the relaxation time was calculated.

scholarly journals Complex q-Rung Orthopair Fuzzy Aggregation Operators and Their Applications in Multi-Attribute Group Decision Making

Information ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 5 ◽  
Author(s):  
Liu ◽  
Mahmood ◽  
Ali
Keyword(s):  
Decision Making ◽  
Fuzzy Sets ◽  
Imaginary Part ◽  
Group Decision Making ◽  
Group Decision ◽  
Aggregation Operators ◽  
Uncertain Information ◽  
Membership Degree ◽  
The Real ◽  
Complex Valued

In this manuscript, the notions of q-rung orthopair fuzzy sets (q-ROFSs) and complex fuzzy sets (CFSs) are combined is to propose the complex q-rung orthopair fuzzy sets (Cq-ROFSs) and their fundamental laws. The Cq-ROFSs are an important way to express uncertain information, and they are superior to the complex intuitionistic fuzzy sets and the complex Pythagorean fuzzy sets. Their eminent characteristic is that the sum of the qth power of the real part (similarly for imaginary part) of complex-valued membership degree and the qth power of the real part (similarly for imaginary part) of complex-valued non‐membership degree is equal to or less than 1, so the space of uncertain information they can describe is broader. Under these environments, we develop the score function, accuracy function and comparison method for two Cq-ROFNs. Based on Cq-ROFSs, some new aggregation operators are called complex q-rung orthopair fuzzy weighted averaging (Cq-ROFWA) and complex q-rung orthopair fuzzy weighted geometric (Cq-ROFWG) operators are investigated, and their properties are described. Further, based on proposed operators, we present a new method to deal with the multi‐attribute group decision making (MAGDM) problems under the environment of fuzzy set theory. Finally, we use some practical examples to illustrate the validity and superiority of the proposed method by comparing with other existing methods.

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